Decompression system and methods of use

Abstract

A decompression surgery system includes a cannula configured to engage a lamina, the cannula including a lumen. The system further includes a guide configured to be received by the cannula, the guide including a guide lumen that is offset from the central longitudinal axis of the guide. The guide can be rotated to multiple positions so the guide lumen can be used to access different parts of the lamina. Instruments for laminar decompression such as a drill bit can be advanced through the guide lumen.

What is claimed is: 
     
         1 . A decompression surgery system comprising:
 a cannula configured to engage a lamina of a patient, the cannula comprising a lumen; and   a guide configured to be removably received within the lumen of the cannula and comprising a guide lumen configured to receive one or more instruments therethrough, wherein the guide lumen is offset from a central longitudinal axis of the guide;   wherein the guide is configured to be move relative to the cannula to multiple positions and be received within the cannula at the multiple positions so that the guide lumen of the guide aligns with a different section of the lamina at each of the multiple positions.   
     
     
         2 . The system of  claim 1 , wherein the cannula comprises a plurality of slots, wherein the guide comprises at least one protrusion, wherein the at least one protrusion is configured to be received within a different one of the plurality of slots at each rotational position of the guide. 
     
     
         3 . The system of  claim 1 , further comprising a stabilizer configured to couple to the cannula to restrict movement of the cannula, wherein the stabilizer comprises a plurality of legs configured to contact a skin surface of the patient or a drape positioned over the skin surface of the patient. 
     
     
         4 . The system of  claim 3 , wherein each of the plurality of legs of the stabilizer comprises one or more non-slip surface features configured to engage the patient. 
     
     
         5 . The system of  claim 3 , wherein the stabilizer comprises a central body, wherein the plurality of legs are configured to rotate about the central body. 
     
     
         6 . The system of  claim 5 , wherein the plurality of legs are configured to rotate about a longitudinal axis of the cannula and to rotate about one or more axes perpendicular with the longitudinal axis of the cannula. 
     
     
         7 . The system of  claim 6 , wherein the stabilizer comprises a knob that can be actuated transition the stabilizer between an unlocked state in which the plurality of legs are rotatable and locked state in which the plurality of legs are locked in position relative to the central body. 
     
     
         8 . The system of  claim 3 , wherein the stabilizer is configured to secured at multiple axial positions along the cannula to adjust a height of the plurality of legs relative to a body of the patient. 
     
     
         9 . The system of  claim 1 , wherein the guide is rotatable between four rotatable positions within the cannula. 
     
     
         10 . The system of  claim 1 , further comprising a light source configured to couple with a proximal end of the cannula. 
     
     
         11 . The system of  claim 1 , wherein the cannula comprises a body and a cap, wherein the cap is adjustable with respect to the body. 
     
     
         12 . The system of  claim 1 , wherein the cannula comprises a superior guard portion configured to contact a posterior surface of the lamina, an inferior guard configured to contact an anterior surface of the lamina, and a recess between the superior guard portion and inferior guard portion configured to receive an inferior edge of the lamina therein. 
     
     
         13 . The system of  claim 12 , wherein the inferior guard portion has a greater length than the superior guard portion. 
     
     
         14 . The system of  claim 1 , further comprising a laminar locator having a pair of protrusions and a recess extending between the pair of protrusions and configured to receive an inferior edge of the lamina therein. 
     
     
         15 . The system of  claim 14 , wherein the laminar locator comprises one or more angled surfaces shaped to shave bone overgrowth while the laminar locator is advanced to the lamina. 
     
     
         16 . A method for performing decompression surgery, the method comprising:
 engaging a cannula with a lamina of a patient, the cannula comprising a lumen;   positioning a guide within the lumen of the cannula in a first position, the guide comprising a guide lumen offset from a central longitudinal axis of the guide;   advancing an instrument through the guide lumen to the lamina and removing a first portion of the lamina using the instrument;   moving the guide to a second position within the cannula so that the guide lumen aligns with a second portion of the lamina; and   advancing the instrument through the guide lumen to the lamina and removing the second portion of the lamina using the instrument.   
     
     
         17 . The method of  claim 16 , further comprising:
 prior to engaging the cannula with the lamina of the patient, engaging a laminar locator with a cannula of the patient;   advancing a dilator over the laminar locator; and   advancing the cannula over the dilator.   
     
     
         18 . The method of  claim 17 , wherein the laminar locator comprises one or move angled edges, wherein the method comprises translating the laminar locator back and forth to shave bone overgrowth by the angled edges. 
     
     
         19 . The method of  claim 16 , further comprising coupling a stabilizer to the cannula, the stabilizer comprising a plurality of legs configured to contact a skin surface of the patient or a drape positioned over the skin surface of the patient. 
     
     
         20 . The method of  claim 19 , further comprising rotating the plurality of legs about a plurality of axes.